I wore polarising prescription sunglasses for 1300 hrs in an S-76B, and found no problems with the glass panel instruments, though there were some light brown wavy (transparent) lines in the front windscreen from the laminations, and the side windows had a slight rainbow tinge. Don't bother with the LGBPDGW comments, but the windows were slightly bent.
At night I had to lean forward and cover the shield with my arms to see out into the very dark bits of the Barrington Tops - despite being a BIG glare shield it only seemed to be anti-sun for daylight rather than anti-internal reflection for night.